graham/aprs.me
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

Improve trail color distinctness and road contrast

Browse source 
Replace trail color palette with bold, high-saturation colors that avoid
yellows, oranges, and grays (common road colors on map tiles). Interleave
warm/cool tones so consecutive color assignments are maximally distinct.

Change color assignment to prefer globally unique colors first, falling
back to proximity-based deconfliction only when all 15 colors are in use.
This commit is contained in:
Graham McIntire 2026-02-20 09:15:22 -06:00
parent 52d182e25e
commit 4558f694f4
No known key found for this signature in database
1 changed files with 37 additions and 22 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

59
assets/js/features/trail_manager.ts
View file

@ -31,22 +31,24 @@ export class TrailManager {
private trailDuration: number; // in milliseconds
private maxTrails: number = 500; // Maximum number of trails to keep in memory
private maxPositionsPerTrail: number = 1000; // Maximum positions per trail
// Colors ordered to maximize contrast between consecutive assignments.
// Avoids yellows, oranges, and grays that blend with roads on map tiles.
private colorPalette: string[] = [
"#E6194B", // Crimson
"#469990", // Teal
"#F032E6", // Magenta
"#4363D8", // Blue
"#D50000", // Red
"#3CB44B", // Green
"#FF1493", // Deep Pink
"#42D4F4", // Cyan
"#911EB4", // Purple
"#00CC66", // Emerald
"#7B68EE", // Slate Blue
"#76FF03", // Lime
"#E040FB", // Heliotrope
"#1E90FF", // Dodger Blue
"#00CED1", // Dark Turquoise
"#32CD32", // Lime Green
"#8B008B", // Dark Magenta
"#9370DB", // Medium Purple
"#FF8C00", // Dark Orange
"#4682B4", // Steel Blue
"#00FA9A", // Medium Spring Green
"#DA70D6", // Orchid
"#008B8B", // Dark Cyan
"#48D1CC", // Medium Turquoise
"#228B22", // Forest Green
"#6495ED", // Cornflower Blue
"#FF1493", // Deep Pink (distinct from highways)
"#20B2AA", // Light Sea Green
"#00BFA5", // Aquamarine
];
private proximityThreshold: number = 5.5; // kilometers
private minMovementThreshold: number = 0.1; // km - minimum total distance to show a trail
@ -298,24 +300,37 @@ export class TrailManager {
return nearbyColors;
}
// Assign a color to a trail based on nearby trails
// Assign a color to a trail, ensuring global uniqueness when possible
private assignTrailColor(
baseCallsign: string,
positions: PositionHistory[],
): string {
if (positions.length === 0) return this.colorPalette[0];
// Collect all colors currently used by other trails
const usedColors = new Set<string>();
this.trails.forEach((trailState, callsign) => {
if (callsign !== baseCallsign && trailState.color) {
usedColors.add(trailState.color);
}
});
const center = this.getTrailCenter(positions);
const nearbyColors = this.getNearbyTrailColors(baseCallsign, center);
// Find the first available color not used by nearby trails
// First priority: pick a color not used by any existing trail
for (const color of this.colorPalette) {
if (!nearbyColors.has(color)) {
if (!usedColors.has(color)) {
return color;
}
}
// If all colors are used, return the first color
// All 15 colors in use — pick one not used by nearby trails
if (positions.length > 0) {
const center = this.getTrailCenter(positions);
const nearbyColors = this.getNearbyTrailColors(baseCallsign, center);
for (const color of this.colorPalette) {
if (!nearbyColors.has(color)) {
return color;
}
}
}
return this.colorPalette[0];
}